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Maintaining Reliability of Supply in the Tarong and Chinchilla Local Areas

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Maintaining Reliability of Supply in the Tarong and Chinchilla Local Areas Powerlink Queensland Project Specification Consultation Report: Maintaining reliability of supply in the Tarong and Chinchilla local areas Powerlink Queensland Project Specification Consultation Report 24 August 2021 Maintaining reliability of supply in the Tarong and Chinchilla local areas Disclaimer While care was taken in preparation of the information in this document, and it is provided in good faith, Powerlink accepts no responsibility or liability (including without limitation, liability to any person by reason of negligence or negligent misstatement) for any loss or damage that may be incurred by any person acting in reliance on this information or assumptions drawn from it, except to the extent that liability under any applicable Queensland or Commonwealth of Australia statute cannot be excluded. Powerlink makes no representation or warranty as to the accuracy, reliability, completeness or suitability for particular purposes, of the information in this document. Page 0 Powerlink Queensland Project Specification Consultation Report: Maintaining reliability of supply in the Tarong and Chinchilla local areas Document purpose For the benefit of those not familiar with the National Electricity Rules (the Rules) and the National Electricity Market (NEM), Powerlink offers the following clarifications on the purpose and intent of this document: 1. The Rules require Powerlink to carry out forward planning to identify future reliability of supply requirements1 and consult with interested parties on the proposed solution as part of the Regulatory Investment Test for Transmission (RIT-T). This includes replacement of network assets in addition to augmentations of the transmission network. More information on the RIT-T process and how it is applied to ensure that safe, reliable and cost effective solutions are implemented to deliver better outcomes to customers is available on Powerlink’s website. 2. Powerlink must identify, evaluate and compare network and non-network options (including, but not limited to, generation and demand side management) to identify the ‘preferred option’ which can address future network requirements at the lowest net cost to electricity customers. Final selection of the ‘preferred option’ is based upon Net Present Value (NPV) analysis of each option. 3. The main purpose of this document is to provide details of the identified need, credible options, identification of the preferred option, technical characteristics of non-network options, and categories of market benefits likely to impact selection of the preferred option. In particular, it encourages submissions from potential proponents of feasible non-network options to address the identified need. 1 Such requirements include, but are not limited to, addressing any emerging reliability of supply issues or relevant ISP actionable projects identified in the Australian Energy Market Operator’s (AEMO) latest Integrated System Plan (ISP), for which Powerlink has responsibility as the relevant Transmission Network Service Provider (TNSP). Page i Powerlink Queensland Project Specification Consultation Report: Maintaining reliability of supply in the Tarong and Chinchilla local areas Contents Document purpose .......................................................................................................................... i Executive Summary ...................................................................................................................... 1 1 Introduction ............................................................................................................................ 5 1.1 Powerlink Asset Management and Obligations ............................................................. 5 1.2 RIT-T Overview .............................................................................................................. 5 2 Customer and non-network engagement .............................................................................. 7 2.1 Powerlink takes a proactive approach to engagement .................................................. 7 2.2 Working collaboratively with Powerlink’s Customer Panel ............................................ 7 2.3 Transparency on future network requirements .............................................................. 7 2.3.1 Maintaining reliability of supply in Tarong and Chinchilla local areas ................. 8 2.4 Powerlink applies a consistent approach to the RIT-T stakeholder engagement process .................................................................................................................................. 8 2.5 The transmission component of electricity bills ............................................................. 8 3 Identified need ....................................................................................................................... 8 3.1 Geographical and network overview .............................................................................. 8 3.2 Description of identified need....................................................................................... 10 3.3 Assumptions and requirements underpinning the identified need ............................... 10 3.3.1 Transformers and Primary Plant ........................................................................ 10 3.3.2 Secondary Systems ........................................................................................... 11 3.4 Primary Plant and Transformers - Asset condition and risks ....................................... 12 3.4.1 Consequences of primary plant and transformer failures .................................. 13 3.4.2 Rules, Jurisdictional and Legislative Compliance – Transformers and Primary Plant ................................................................................................................... 14 3.5 Secondary Systems - Asset condition and risks .......................................................... 14 3.5.1 Consequences of failure in an obsolete system ................................................ 15 3.5.2 Fleet-wide implications of obsolescence ........................................................... 15 4 Required technical characteristics for non-network options ................................................ 16 4.1 Criteria for proposed network support services ........................................................... 16 5 Potential credible network options to address the identified need ...................................... 18 5.1 Option 1: Replace all at risk assets by June 2025 ....................................................... 18 5.2 Option 2: Transformer-end Chinchilla Substation & replace selected assets by 2025 19 5.3 Material inter-network impact ....................................................................................... 20 6 Materiality of market benefits .............................................................................................. 20 6.1 Market benefits that are material for this RIT-T assessment ....................................... 20 6.2 Market benefits that are not material for this RIT-T assessment ................................. 20 6.3 Consideration of market benefits for non-network options .......................................... 21 7 Base Case ........................................................................................................................... 21 7.1 Modelling a Base Case under the RIT-T ..................................................................... 21 7.2 Tarong - Chinchilla Base Case risk costs .................................................................... 21 7.3 Base Case assumptions .............................................................................................. 22 Page ii Powerlink Queensland Project Specification Consultation Report: Maintaining reliability of supply in the Tarong and Chinchilla local areas 7.4 Modelling of Risk in Options ........................................................................................ 23 8 General modelling approach adopted for net benefit analysis ............................................ 23 8.1 Analysis period ............................................................................................................. 23 8.2 Discount rate ................................................................................................................ 23 8.3 Description of reasonable scenarios and sensitivities ................................................. 23 8.3.1 Reasonable Scenarios....................................................................................... 23 9 Cost benefit analysis and identification of the preferred option .......................................... 24 9.1 NPV Analysis ............................................................................................................... 24 9.2 Sensitivity analysis ....................................................................................................... 25 9.3 Sensitivity to multiple parameters ................................................................................ 26 9.4 Conclusion ................................................................................................................... 27 10 Draft recommendation ......................................................................................................... 27 11 Submissions requirements .................................................................................................. 28
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